In-service welding is a specialized welding technique performed on pipelines, structures, or equipment while they are still in operation and under load. It is often used in industries like oil and gas, utilities, and infrastructure to repair or reinforce components without the need for shutdowns or extensive downtime. Skilled welders use techniques and equipment that can withstand the environmental and operational conditions, ensuring the integrity of the weld and the safety of the surrounding area. In-service welding demands strict adherence to safety protocols and the use of specialized materials and technologies to minimize risks and maintain the structural or functional integrity of the equipment or pipeline being worked on.